Twitter, Facebook, Groupon, LinkedIn, Pandora and other names command large valuations. Twitter's curent valuation is estimated at between 8-10 billion dollars. Twitter has sales revenue for 2010 of $45 million, and it had a loss as it invested heavily in data centers and hiring. Estimates of revenue for 2011 are between $100 million and $110 million. Twitter is trying to build its ad revenue with a 20 person sales team headed by Mr Bain, a former Fox Interactive Media president.